Error when I try to remove the ellipsis from the pageheader-CodePudding

I have a program that was developed using c# and UWP that has errors that do not crash the program.

I have 2 control bars, a page header and page footer and the buttons are small enough that I do not need the ellipsis so I am trying to remove the ellipsis.

I am using the following XAML code:

Controls:PageHeader x:Name="pageHeader" Frame="{x:Bind Frame}" RelativePanel.AlignLeftWithPanel="True" RelativePanel.AlignRightWithPanel="True"  RelativePanel.AlignTopWithPanel="True" x:Uid="MapPageHeader" IsOpen="True" IsSticky="True" Height="40" DefaultLabelPosition="Right" EllipsisVisibility="Collapsed">

The issue is I get the blue wiggly lines below the EllipsisVisibility="Collapsed" text with the explanation that "Unable to convert Collapse to an object of type Template10.Behaviors.EllipsisBehavior Visibilities.

What does this mean?

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